WAUKEGAN, Ill. (WLS) — On Wednesday morning, the accused gunman in the Highland Park parade tragedy entered a not guilty plea on all counts.

Robert Crimo III, 21, had been indicted on 117 counts after he allegedly killed seven people and wounded at least 30 others.

Investigators have said Crimo planned the attack for weeks, maybe even months.

RELATED: Highland Park temporarily moves memorial items honoring parade shooting victims

He was back in court just a week after a grand jury indicted him on 117 counts, all of which include felony charges of murder, attempted murder and aggravated battery.

Lake County State’s Attorney Eric Rinehart took time after the arraignment to explain some of the plethora of charges.

“Seven people lost their lives; there are three alternative ways that we see, in very many murder cases, to charge the offense of murder. That’s why there are 21 counts. If you were to go to any murder prior to this proceeding, you would see that very typically there are three. Sometimes there are two, but most often there three,” he said.

Police ramped up security outside the courthouse ahead of Crimo’s Wednesday appearance and subsequent not guilty pleas.

The courtroom had strict rules under a decorum order for the case.

There were very few seats available, and attendees wearing anything in support of Highland Park were not expected to be allowed inside.

Victims of the shooting were invited to watch via Zoom.

Crimo was escorted into the courtroom by three officers, sitting handcuffed and masked, wearing a Lake County Jail jumpsuit next to his three attorneys.

Crimo previously confessed to the shooting, authorities have said.

People hurt in the shooting ranged from 8 to 80 years old, including 8-year-old Cooper Roberts, who was paralyzed from the waist down when the shooting severed his spine.

RELATED: Cooper Roberts update: Boy paralyzed in July 4 parade shooting moves from hospital to rehab center

As the mourning and recovery continues, the Highland Park community is continuing to depend on each other to make it through this. A National Night Out Tuesday highlighted that unity.

“This community, who from the moment this tragedy occurred has worked together, shoulder-to-shoulder to help those in need, police officers, firefighters, health communicators, medical personnel and citizens alike, working together to restore our peace and health and well-being for all involved,” Highland Park Police Chief Louis Jogmen said.

Mayor Nancy Rotering also voiced her support for law enforcement at the event.

“They are our hometown heroes. They are an integral part of our community, and they are one of the many reasons that we can confidently say, ‘We are Highland Park,'” she said.

Attorneys agreed to return on Nov. 1 at 11 a.m. for a case management conference.

Copyright © 2022 WLS-TV. All Rights Reserved.

You May Also Like

Meghan Markle's Cheeky Behavior Toward Prince William Reportedly Amped Up Harry Feud

Unique Nicole/Getty & Mikolaj Barbanell/Shutterstock & undefined Prince William…

'I was screaming': Footage shows store worker being attacked over alleged robbery

Police are investigating after a grocery store worker in Victoria’s Yarra Valley…

Trump-pardoned Jan. 6 rioter who allegedly tried to meet up with minor is now behind bars after getting hit with warrant for child solicitation

Left: Andrew Taake. Right: Taake seen holding a whip during a confrontation…

DIDDY RUSHED TO HOSPITAL: DANGLED MODEL OFF 17TH FLOOR BALCONY? 

Sean “Diddy” Combs reportedly rushed to the hospital hours after prosecutors filed…